CVE-2026-43089

A flaw was found in the Linux kernel's xfrm_user module. A one-byte padding hole in the struct xfrm_usersa_id was not properly initialized before being copied to userspace. This information disclosure vulnerability could allow a local attacker to obtain sensitive information from kernel memory.

Red Hat acknowledges the upstream Linux kernel correction for «xfrm_user» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.